My son is 3.5 years old and still wears 3T but is changing to 4T. He is 37 pounds and almost 40 tall. Got 4T in these pajamas He loves them! Mainly because they are Pokemon but also because they are very soft. The quality is good, even after several washes. They're fleece but not very heavy, lighter than Carter's fleece pajamas. My son usually gets hot and slept great in these pajamas.
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